How can I motivate myself to keep going when people around me randomly comment on how fat I am?

i have started working out, but i don't tell that to everyone and i can't stop everyone from commenting. usually my guy friends say all of this. i am a 19 year old girl 68 kgs 157 cm with fat mostly around my shoulders and arms. moreover i feel like guys know only 2 body types, skinny and rest all are fat.

How can I motivate myself to keep going when people around me randomly comment on how fat I am?
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